Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile needs no restatement. The description adds only the fallback behavior for an omitted commit, and says nothing about what a build log contains, its size, or failure modes for a commit with no build.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short sentences, front-loaded with the action and followed by the default behavior. No filler, though the extreme terseness leaves useful context unstated rather than being a model of efficient completeness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

A low-complexity, two-parameter read tool with full schema coverage, an output schema, and complete annotations. The description covers the one behavioral decision an agent must make (omit commit_id or supply one), so nothing essential is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, and the schema itself documents that commit_id is an optional UUID defaulting to the latest commit. The description restates that default without adding syntax, format, or edge-case guidance, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Read the build log') with clear scope limitation to a commit. An agent can distinguish it from projects_builds_list, though the description never names that sibling explicitly, so differentiation is inferred rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

'Defaults to the latest commit' implies a usage pattern for the common case where no commit is supplied. However, there is no statement of when to prefer this over projects_builds_list or how to obtain a commit_id in the first place, leaving routing to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.